pf2e.fyi
From Pathfinder Impossible Magic, which isn't enabled.

Trinity Geode (Major)

ITEM 12
EARTHMAGICALSPELLHEART
Price 1900 gp
Usage affixed to armor or a weapon
Bulk —

The crystal chamber within this split geode is divided into three lobes of equal size. The spell DC of any spell cast by Activating this item is 29.

  • Armor After you cast an earth spell by Activating the geode, you gain resistance 5 to physical damage (except adamantine) until the end of your next turn, or double the resistance for a non-cantrip spell.

  • Weapon After you cast an earth spell by Activating the geode, your Strikes with the weapon deal an additional 1d8 bludgeoning damage until the end of your next turn.

Effect: Trinity Geode - Armor

Effect: Trinity Geode - Weapon

Activate Cast a Spell
Effect You cast Scatter Scree.
Activate Cast a Spell
Frequency once per day
Effect You cast 4th-rank One with Stone.
Activate Cast a Spell
Frequency once per day
Effect You cast Mountain Resilience.
Pathfinder Impossible MagicORC